Researchers deduced that there is a positive association between depression/depressive symptoms and bedtime procrastination, which is the action of delaying one's sleep.

Claremont McKenna College

Longitudinal and cross-longitudinal studies suggest that sleeping later at night is correlated with worse mental health. 

Association with Sleep

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22. Komischke-Konnerup, K. B., Zachariae, R., Johannsen, M., Nielsen, L. D., & O’Connor, M. (2021). Co-occurrence of prolonged grief symptoms and symptoms of depression, anxiety, and posttraumatic stress in bereaved adults: A systematic review and meta-analysis. Journal of Affective Disorders Reports, 4, 100140. https://doi.org/10.1016/j.jadr.2021.100140

23. Auersperg, F., Vlasak, T., Ponocny, I., & Barth, A. (2019). Long-term effects of parental divorce on Mental Health – a meta-analysis. Journal of Psychiatric Research, 119, 107–115. https://doi.org/10.1016/j.jpsychires.2019.09.011 

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30. Yttredahl, A. A., McRobert, E., Sheler, B., Mickey, B. J., Love, T. M., Langenecker, S. A., Zubieta, J. K., & Hsu, D. T. (2018). Abnormal emotional and neural responses to romantic rejection and acceptance in depressed women. Journal of affective disorders, 234, 231–238. https://doi.org/10.1016/j.jad.2018.02.083

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References for Depression

Several studies have shown that individuals diagnosed with insomnia are at risk of developing depression or at risk of relapsing. In addition, individuals who have both insomnia and depression are more susceptible to longer and more severe depressive episodes.

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